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re https/session.master ct/mastering@/assignment/ist/5398480 hrome Secure https /session.masteringphysics.com/myct/it Unit& Day 4 17-18Problem 6 23 NM Unit 6 Day 4 17-18 emview 80218746&offset-next; roblem 6.23 Part A At an accident scene on a level road, investigators measure a cars skid mark to be 86 m long It was a rainy day and the coefficient of friction was estimated to be 0.35 Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes. Express your answer to two significant figures and include the appropriate units Value Units My Answers 9 Part B Why does the cars mass not matter? Since both the change in kinetic energy and the work done by fricsion are proporsional to the mass mass cancels out of the equation Since the wok done by friction does not depend on mass Since the change in kinesc energy and the work done by friction do not depend on mass My Aneners Ge 8 9/6Explanation / Answer
6.23) a) 1/2 m v2 = mu * m g * d
v2 = 0.35 * 9.8 * 86 * 2
v = sqrt [589.96]
v = 24.3 m/s
b) since both change in KE and WD by friction are propotional , the mass cancels out in the equation
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